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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VWFAnalytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Development Client Project ID Chevron 9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Hobert Mallory Work Order# 9604898 06, 07 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# MSO415968270EXA MSO415968270EXA MSO415968270EXA <br /> Analy. Method EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 <br /> Analyst- <br /> MS/MSD #. <br /> Sample Conc <br /> Prepared Date- <br /> Analyzed Date <br /> Instrument I D #- <br /> Conc Spiked <br /> Result: <br /> MS % Recovery <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RPD Limit <br /> LCS# SBO41596 SB041596 SB041596 <br /> Prepared Date 4/15/96 4/15/96 4/15/96 <br /> Analyzed Date 4/15/96 4/15/96 4/15/96 <br /> Instrument I D # F4 F4 F4 <br /> Conc. Spiked 3300 pg/Kg 3300 Mg/Kg 3300 pg/Kg <br /> LCS Result 2700 2100 2600 <br /> LCS %Recov 82 64 79 <br /> LCS 40-130 30-110 50-115 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,lnterferent4ree matrix that is analyzed using the same reagents, <br /> .SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Kvin Follett **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9604898 TTT <4> <br />